新型非编码式键盘扫描方法研究     

徐彩霞 《苏州市职业大学学报》2010,21(1):26-28

针对低成本单片机行列式键盘应用中键盘占用硬件资源多、实时性差等问题,开发了一种采用定时扫描和计数去抖方法的键盘系统,并建立了实时操作系统的简单任务调度模型,实现了键码按键识别、消抖处理和计算键码值功能．  相似文献   

Accuracy of three Android-based pedometer applications in laboratory and free-living settings     

Jia Yan Leong 《Journal of sports sciences》2017,35(1):14-21

This study examines the accuracy of three popular, free Android-based pedometer applications (apps), namely, Runtastic (RT), Pacer Works (PW), and Tayutau (TY) in laboratory and free-living settings. Forty-eight adults (22.5 ± 1.4 years) completed 3-min bouts of treadmill walking at five incremental speeds while carrying a test smartphone installed with the three apps. Experiment was repeated thrice, with the smartphone placed either in the pants pockets, at waist level, or secured to the left arm by an armband. The actual step count was manually counted by a tally counter. In the free-living setting, each of the 44 participants (21.9 ± 1.6 years) carried a smartphone with installed apps and a reference pedometer (Yamax Digi-Walker CW700) for 7 consecutive days. Results showed that TY produced the lowest mean absolute percent error (APE 6.7%) and was the only app with acceptable accuracy in counting steps in a laboratory setting. RT consistently underestimated steps with APE of 16.8% in the laboratory. PW significantly underestimated steps when the smartphone was secured to the arm, but overestimated under other conditions (APE 19.7%). TY was the most accurate app in counting steps in a laboratory setting with the lowest APE of 6.7%. In the free-living setting, the APE relative to the reference pedometer was 16.6%, 18.0%, and 16.8% for RT, PW, and TY, respectively. None of the three apps counted steps accurately in the free-living setting.  相似文献   

GRW理论与波函数坍缩问题探讨     

程瑞  何坤 《科学技术哲学研究》2020,37(2):20-26

测量问题一直是量子力学的难题之一,其不仅割裂了物理理论对世界的描述的统一性,还使量子理论陷入某种非实在的困境中。针对于此,量子本体论领域的GRW理论企图以一种能引发波函数的自发坍缩的动力学来统一宏观与微观系统,并解决该难题。然而该理论中暗含了一个新的“尾巴问题”,这个尾巴问题不仅使GRW理论不能达成其目的,而且还带来了某种“计数异常”的悖论,使GRW理论不得不为了维护其理论的实在性而做出新的诠释。文章中通过对计数异常的由来的分析,总结在坍缩理论中,要避免类似的问题的重点在于解决好宏观与微观系统的本质差别。  相似文献   

青年教师上好自学考试课的有效途径——以会计专业为例     

张婷 《贵州教育学院学报》2008,24(6):63-66

针对自学考试特殊的教学模式和生源,青年教师应如何规避教学经验欠缺的不足,取得良好教学效果是值得研究的问题。了解自考学生特点、培养良好的职业道德情感、提高自身专业水平和激发学生学习兴趣是青年教师上好自学考试课的有效途径。  相似文献   

对定标器计数指示的改进     

李建民 《河北北方学院学报(社会科学版)》1996,(6)

对FH—408定标器计数指示电路进行改进,使定标器之自动计数档中10°秒以下各档用于实验计数。可缩短实验时间,增加计数次数,扩展了仪器功能。  相似文献   

公允价值若干问题探讨   总被引：3，自引：0，他引：3  

张玉红  刘爱敏 《潍坊高等职业教育》2006,(3)

本文探讨了关于公允价值的一系列问题。首先分析了公允价值的涵义,并对于其计价作了初步阐述,介绍了公允价值计价的一般方法。最后对于其计价模式进行了分析。  相似文献   

数学能力的脑与认知科学研究及其对早期数学教育的启示     

贺丽霞 《全球教育展望》2012,(9):41-46

数学能力是基础性的认知能力,包括数量、空间和逻辑推理等认知能力。早期数学教育有助于在儿童发育和发展的关键期为儿童奠定认知和神经基础,从而培养儿童抽象而精确的数学思维能力与问题解决能力。脑与认知科学研究表明,儿童生来具有数的概念,体现在两个独立的数的核心表征系统,一是大数系统,模糊估计、粗略表征物体的数量幅度;二是小数系统,精确计数、清晰表征每一个物体。早期数学教育可以借鉴当前丰富的脑与认知科学研究成果,将科学理论和教学实践相结合,利用儿童先天具备的数学潜质,逐渐深入而广泛地培养儿童的数学技能。培养儿童的早期数学能力需要家庭、学校和社会的共同努力。  相似文献   

Finding and then counting out-of-school children     

《Compare》2012,42(2):187-212

In developing countries, population estimates and assessments of progress towards the Millennium Development Goals are based increasingly on household surveys. It is not recognised that they are inappropriate for obtaining information about the poorest of the poor. Typically, they omit by design: those not in households because they are homeless; those who are in institutions; and mobile, nomadic or pastoralist populations. In addition, in practice, because they are difficult to reach, household surveys will typically under-represent: those in fragile, disjointed or multiple occupancy households; those in urban slums; and may omit certain areas of a country because of security considerations. This article reviews estimates of the numbers of children in each sub-group, focussing on countries endorsed by the Fast Track Initiative, and estimates that 21 million rather than 14 million children are out-of-school in those countries; and that worldwide 115 million rather than 67.5 million are out-of-school. Methods of improving population counts are briefly discussed.  相似文献   

重尾随机和的精致大偏差及其在风险理论中的应用     

杨洋  林金官 《东南大学学报》2010,26(3):498-501

对2列非负带有次指数分布的独立同分布随机变量的差,以及随机脚标为负相协随机变量生成的严平稳更新记数过程进行了探讨.利用修正的随机变量部分和的精致大偏差结果及关于负相协随机变量的基本更新定理和中心极限定理,得到了随机变量列差的随机和的精致大偏差.考虑了基于顾客来到过程的保险风险模型,利用随机和的精致大偏差结果,得到了当顾客数或者时间趋于无穷时,保险公司破产概率的一致渐近性.  相似文献   

实数的一个等价条件及对∞的推广分析     

黄荣辉 《保山师专学报》2010,29(5):48-50

主要通过研究实数小数位数得出实数的一个等价条件,并且论证实数及有理数封闭性质,并对∞作相应推广。  相似文献